Full automatic hoist



Nov. 10, 1953 F. w. com-ms FULL AUTOMATIC HoisT 2 Sheets-Sheet 1 FiledAug. 4, 1951 N Md MW Mm m V m I v fl K D E R F. w. COFFING FULLAUTOMATIC HOIST Filed Aug. 4, 1951 2 Sheets-Sheet 2 Patented Nov. 10,1953 FULL AUTOMATIC HOIST Fredrick W. Coffing, Danville, Ill., assignorto Coiling Hoist Company, Danville, 111., a corporation ApplicationAugust 4, 1951, Serial N 0. 240,405

15 Claims. (Cl. 254-167) The present invention relates to improvementsin hoists or like devices, which may be used not only as hoists but maybe used as wire stretchers or used in connection with load bindingdevices.

One of the objects of the invention is to provide a simple ruggedcompact hoist capable of step by step raising or lowering of the load,and which whendesired may be so manipulated as to permit free running ofthe hoist chain used in connection therewith.

. Another object of the invention is to provide a hoist structure of theabove characteristics in which the manipulation of the parts forselectively raising or lowering the load for free chaining maybeeffected by simple manipulation by the operating handle and without anyother manual control than that provided by the manipulation of theoperating handle.

The present invention is a continuation in part for so much as isdisclosed therein of my copending application for improvement in FullAutomatic Hoist and Binder filed March 9, 1950, Serial No. 148,727, nowabandoned.

For the purpose of disclosing the invention I have illustrated in theaccompanying drawings certain embodiments thereof.

In said drawings Fig. l is a side elevation of one form of a hoistembodying my invention.

Fig. 2 is an end elevation, partially in section, of the illustration inFig. 1.

Fig. 3 is a side elevation similar to Fig. l, with the handle at the endof its load lowering stroke, and

Fig. 4 is a similar elevation to Fig. 1 with the parts in free chainposition.

Fig. 5 is a side elevation of a modification of the structuresillustrated in Figs 1 to 4.

Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Fig. 7 is a side elevation similar to Fig. 5 with the handle in theposition that is reached at the lower limit of its lifting stroke.

Fig. 8 is a side elevation similar to Fig. 5 showing the handle inposition at the beginning of the lowering stroke. and

Fig. 9 is a side elevation similar to Fig. 5 with are spacers M. Thisstructure provides a means not only for holding the side plates Ill-l0in position to form a housing for the structure, but also maintains thesame in their spaced apart relation.

At the lower end of the plates I provide a shaft or pin [5, whichextends through the plates and carries the roller member l6 over whichthe link chain I! is adapted to pass. It is to be noted that this rolleris provided with annular central groove l8 on either side of which areprovided annular flanges 19. The central groove l8 provides anaccommodation for the vertically disposed links of the chain [1, whilethe horizontally disposed links of the chain ride over or on the flangesl9. In the structure illustrated the chain itself provides the ratchetteeth with which the operating pawl and the holding pawl are adapted tocooperate. The holding pawl 20 is mounted on a pivot pin 2| extendingthrough the plates and is provided with a pawl end restricted in crosssection as at 22 so that it will engage in the horizontal links of thechain IT. This pawl is biased in its engaging position through themedium of a coiled spring 23, one end of which is attached to the baseof the pawl as at 24 and the other end of which is secured as at 25 toone of the plates I0. This holding pawl is provided with a pin 26extending through a slot 21 in a side plate, the purpose of which willappear more fully hereinafter.

Oscillatingly mounted on the shaft or pin IS on the outside of theplates [0 are a pair of links or arms 28, one end of which arms arepivotally mounted on the shaft. The pin or shaft I5 is locked inposition through the medium of snap rings 29. The outer ends of theselinks 28 have Oscillatingly mounted to the same on a transverselyextending pin 29 an operating pawl 30, the end of which is reducedsufiiciently to engage in the horizontal links of the chain. Thisoperating pawl 30 is extended to provide a handle 3| which may be acontinuation of the pawl or may be a separate piece secured to theextension of the pawl.

Rotatingly or oscillatingly mounted on the pin I5 is what may be termeda cam structure 32 which is provided with an extension cam arm 33 havinga notch 34 in one face thereof adapted to, under predeterminedconditions, engage with the pin 26 on the holding pawl 20. This cammember in its periphery is provided with a pair of shoulders 35 and 3Bwhich, under predetermined conditions, are adapted to be engaged by apin 31 on one of the links 28.

In normal hoisting operation of the structure 3 above described, thelinks 28 are swung upwardly on their pivotal connection with the shaftl5 by raising the handle 3|. When they have reached the normal limit oftheir upward stroke, by pulling down on the handle 3| the pawl 30 ismoved into engagement with one of the horizontal links ofthe chain I1,which effect provides a ratchet tooth; and by pulling down on the handlewith the pawl engaged, the wheel I6 is rotated in a clockwise direction,moving the chain l! in a hoisting direction. During, this movement theholding pawl 20 ratchets over the links or teeth of the chain;

limits of the normal operation, the parts may When; the; handleandoperating pawls have reached the lower then be again raised to takeanother bite ii J and during this raising operation, of coursatheholding pawl is efiective for preventing the weight of the load on thechain I1 to cause a reverse-"movement 'ofthewheel and chain.

If it be desired to lower the load, the-links 28 and holding pawl areswung into the position illustrated in Fig. 3. Int-his position it is'to be noted that the operating pawl 30 is in engaging position and thatthe pin 3! has; engaged the shoulder 36- of the floating cam moving thearm 33 intoa position to move, and hold, the holding pawl out ofengaging position. Under these circumstances with the operating pawlstill in engaging position, the handle and links can be raised under thecontrol of the operator, allowing the weight of the load to move theload chain in the opposite direction and rotate the wheel 16 in acounterclockwise direction. Asthe parts move upward, the pin 31-eventually strikes the shoulder 35 kicking the notch 34 out of engagingand holding position with respect to, the pin 26 on the holding pawl,and allowing the holding pawl to drop into holding position so that thehandle and operating pawl, may be released to be lowered for anotherbite or into .theposition illustrated in Fig. 3, at which time, ofcourse, the P n 31 i n a th sh ul 3 mo in the cam. holding arm 33, intoa position tomove he holding paw ut of t n g n sit on- 'It will beunderstood, or course, that when t e p ts a h the, pos t n. llustratedn. F a, sli h ownward pullonlthe holding pawl will rotate the ratchetwheel I6, sufliciently in aloc wise i ectionv o relieve the holdi pa Ostrain. thereon. s hat. it. an. eadily be m ed toits non-hold n p i n-If it be desired to.- place. the. hoist in, a freechainingposition,after theholding pawl; hasbeen moved to its disengagedposition by. the movement, of the handle and links to the positionillustrated inliig. 3, the links and handle may. be

swung upwardly, but not far enough to. cause the pin 31 to engage theshoulder 35 to, disengage the holding pawl; and at the same time thehandles-l may be, swung on its pivot to disengage th op r t n pawl.With. the two pawl n his position and both in disengaged positionqfreechaining is effected.

InFigs. 5 to 9 I have illustrated a. modification of the structure shownin Figs. 1 to 4 inclusive, which structure is more particularly adaptedfor use with a roller or sprocket type chain. I have provided a pair ofside plates 38 -38 similar to the side plates Ill. At the top of thehousing formed by these side plates 33-48 a hook is mounted in an eye39, which in turn is fastened the swivel halves 40 extending from theframe plates and secured by means of a bolt 4 4i headed as at 42 at oneend and receiving a nut 42' at the other end.

Rotatably mounted in the plates 38-38 at the opposite end from theswivel halves is a shaft 43 on which is rotatably mounted a ratchetwheel 44 having ratchet'teeth 45 so faced as to operate betweenthe linksof the roller chain 46. Above the shaft 43 and'the ratchetwheel 44 ismounted a holding pawl pin 47, which extends through the plates, beingheaded as at 48 at .one;.-endand receiving a cotter pin or similardevice 48 at the other. Mounted upon the pin is. holding pawl 49, whichis equally spaced between the plates- 38, spacer sleeves such as 41'surrounding the'pin and being interposed betweentheisides of the pawland the plates. The pawl 49 is biased into engaging position with theteeth 45 through the medium ofa coiled spring 50, one end of which islooped over a pin 5| on the free end of the pawl; anditheother .end': ofwhich is anchored as .at'-52.: to one of the side: platesl Thispin 5 I,on whichthe end ofthe coiledY-spring bears, projects through a slotv 531in the side plates for a purpose which will Imoreful'ly hereinafterappear.

Mention should 'be'made' of the fact that the ratchet wheel 44 ismaintained in its spacedposi tion between the p1ates.38:throughthe-means of suitable sleeves 54 surrounding the pin 4,1! and disposedone on each side of thera'tchet' wheel so that the same is maintainedinits centered position. 7

Oscillatingly supported on thepin or's'haft 43 is a pair of links 55,which are rotatably .oroscillatingly mounted on said pin 43 at oneend,and at the other end has pivotally mounted thereon through the mediumofthe pin 55 the operating pawl 51. Thispawl, it will be noted, isprovided with an extension 58 which will receive the-hol low end of ahandle 59, the handlebeing main-.- tained in relation through asuitablepin: 60 extending through thehandle andthrough the extension 58.Thelinks and associated parts mounted onthe pin 43 aremaintained in position and against displacement throughthe-medium of snap rings 6!. r

A floating cammember 52 similar tothe-fioating cam member 32in-the-structureillustrated in Figs. 1' to 4-is mounted on the pin orshaft 43, and this floating oanrmember is provided-with an extension arm63- having a cam notch 64 therein adapted underpredeterminedcircumstancesto notch in its periphery to provide'a pair of shoulders65- and 66, functionally the same as the shoulders 3'5 and 35 in thestructure illustrated inFigs.1to4.

Mounted-on the'pin 56isa= cam lever 61 which is adapted to beoperativelyassociated with one or the other shoulders t5; and 66 underpredetermined conditions. 'This cam-leverisibiased in one directionthrough the medium on a coiled spring 68 against a stop pin 61 0mm ofthe links 61', said" spring surrounding the pin- 56' andhaving one endbearing upon again 69 on-oheendofthe cam lever 67 and the opposite endlooped over and bearing upon-theoperating pawl: 51j 'asat 10.

It is to be noted-thatthefholding pawl 49' and the operating; pawl 51are each doublanotched asat -11 to provide a projectingnose-andafollowing;shoulder-*so-thatthe sprockettooth-may be contactedeither by the shoulder as 'shown in-F-ig,

5 or by the nose as shown in Fig. 9, which will permit half linkoperation of the roller chain in lifting the load.

In operation, referring first to Fig. 5, the load pawl is shown biasedin engaging position to take the load and hold the same when theoperating teeth of thesprocket wheel, thereby lifting the load. Theoscillating movement of the handle up and down may be continued untilthe load is raised to the desired point.

If it is desired to lower a load,it will be noted that in Fig. 7 thehandle is in substantially the same position as in Fig. 5, although itis slightly lowered. If the handle is slightly raised and more .or lessfully rotated ina counterclockwise direction about the pivotal pin 56,the operating pawl will be caused to clear the sprocket tooth with whichit is engaged, and swung downwardly clearing the teeth. When theoperating pawl has reached its lowermost position, that is the positionillustrated in Fig. 8, the cam lever 61 engaging against the shoulder 65will rotate the floating cam member 62 in a clockwise direction causingthe notched portion 64 of the extension 63 to engage the pin 5|, andwith a slight downward movement of the operating pawl to relieve thetorsion on the holding pawl, the arm 63 and notch 64 engaging the pins5| will move and hold the holding pawl out of tooth engagement.Therefore, with the operating pawl in engagement with one of the ratchetteeth, the ratchet wheel 44 may controlledly rotate under load in ,acounter-clockwise direction as the handle and operating pawl are movedupwardly. At this point the cam lever 61 will engage the shoulder 66rotating the floating cam 62 in a counterclockwise direction todisengage the arm 63 from the pin 5|, thus permitting the holding pawlto drop back into sprocket wheel holding position. This operation may becontinued by oscillating the holding pawl as long as it is desired, toallow the load to lower.

If it is desired to effect a free chaining operation of the hoist, theholding pawl 49 is moved out ,of tooth engaging position through theaction of the arm 63, as above described. Upon then ,raising the handle59, the cam lever 61 is engaged with the shoulder 66 as shown in Fig. 9to throw the operating pawl out of engagement with the teeth 45 of thesprocket wheel 44. The sprocket wheel may then be freely rotated ineither direction.

In the side plates 38 there are provided stop pins 13, which act as achain shedder to prevent the free end of the roller chain from hittingthe load carrying side of the roller chain when the handle is shown inthe position illustrated in Fig. 8.

The invention claimed is:

l. A structure of the character described comprising, in combination, ahousing, a rotatable wheel rotatably supported by said housing, aholding pawl pivotally supported upon said housing and normally biasedtoward holding position relative to said wheel, a pair of supportinglinks pivotally mounted on said housing and coaxially with saidrotatable wheel, an operat- ;ing pawl operatively, associated with saidwheel pivotally supported by said links, an operating lever rigid withsaid operating pawl, a cam memher for moving and holding said holdingpawl in inoperative position, and means carried by said links forcontrolling the movement of said cam member into and out of operativeposition.

2. A structure of the character described comprising, in combination, ahousing, a rotatable wheel rotatably supported in said housing, aholding pawl pivotally supported on said housing and having its free endbiased in holding relation to said wheel, a pair of links pivotallysupported coaxially with said wheel and on said housing, an operatingpawl pivotally mounted at the free end of said links, an operating leverrigid with said operating pawl, a floating cam member oscillatable aboutthe axis of said wheel having means movable into engagement with aportion of said holding pawl for moving and holding said pawl ininoperative position,

and means carried by said links for operatively moving said floating caminto and out of operative position.

3. A structure of the character described comprising, in combination, ahousing, a rotatable wheel rotatably supported by said housing, aholding pawl pivotally supported on said housing and normally biasedtoward holding position relatively to said Wheel, a pair of supportinglinks pivotally supported on said housi coaxially with said wheel, anoperating pawl pivotally supported at the free end of said links and inoperative position to said wheel, an operating lever rigid with saidpawl, a floating cam oscillatable about the axis of said wheel havingspaced apart abutments at its periphery and an operating arm movableinto and out of holding relation to said holding pawl, and means carriedby said links movable into operative relation to said abutments formoving said floating cam into and out of holding position relatively tosaid holding pawl.

4. A structure of the character described comprising, in combination, ahousing, a rotatable wheel rotatably supported by said housing, aholding pawl pivotally supported upon said housing and normally biasedtoward holding position relatively to said wheel, a pair of supportinglinks pivotally mounted upon said housing coaxially with said wheel, anoperating pawl operatively associated with said wheel and pivotallysupported on the free ends of said links, an operating lever rigid withsaid operating pawl, a stop member carried on the free end of saidholding pawl, a floating cam oscillatable about the axis of said wheeland including a cam arm having a holding portion, and means carried bysaid links for moving said cam arm into and out of holding relation withrespect to said stop member.

5. A structure of the character described comprising a housing, asprocket wheel rotatably mounted upon said housing and adapted toreceive a roller chain, a holding pawl pivoted on said housing andhaving its free end biased into holding engagement with the teeth ofsaid sprocket wheel and having a stop member on the side face thereof, apair of links pivotally supported on said housing coaxially with saidwheel, an operating pawl pivotally mounted on the free ends of saidlinks and operatively movable into engagement with the teeth of saidsprocket wheel, each of said pawls having a nose ,for toothengagementand a shoulder for tooth engagement selectively engageablewith the teeth of said sprocket. wheel; an' operating lever rigid withsaidoperating pawl, means? engagingsaid stop member for moving andholding said holding pawl out of engaging position, and means carried bysaid links for engaging said moving means to move the same into and outof locking position.

6. A structure of the 'characterdescribed comprising, in combination, ahousing, a rotatable wheel rotatably supported in said housing, a

holding pawl pivotally supported on said: housing and normally biasedtoward holding position relative to said wheel, a pair of supportinglinks pivotally supported on said housing otally mounted on said linkscoaxial with the 'pivotof said operating pawl and engagable with saidabutments for-controlling the movement of said floating cam, and meanstor biasing said can! lever intone direction. r

7. Astructur-e of the character described comprising, in combination, ahousing, a rotatable sprocket wheel rotatably supported upon saidhousing and adapted to receive a roller chain, 'a holding pawl pivotallymountedon said housing and biased into an engaging position relativelyto the sprocketteeth of said wheel, a pair of links pivotally supportedon said housing coaxially with said wheel, an operating pawl pivotallymounted on the free'ends of said links, an operating lever rig-id withsaid operating pawl, a floating cam oscillatable coaxially with the axisof said sprocket wheel and having means for engaging and moving saidholding pawl into inoperative positicn,--said cam having spaced apartshoulders on its periphery, a cam lever pivotally mounted on the freeends of said links coaxially with the pivotalmounting of said operatingpawl, a stop carried by said links ior limiting the movement of said camlever in one direction, and means for biasing said cam leveragainst'said-stop, the end, of said cam, lever being movable by themovement of said links into selective engagement with the opposedshoulders of said floating cam.

8. A-structure of the character described comprising, in combination, apair of spaced apart housing plates, a rotatable sprocket wheelrotatably mounted between said plates and adapted to receive a rollerchain, a holding pawl pivotally mounted between said plates and havingits free end biased into holding engagement with the teeth of thesprocket of said wheel, at "least one of said plates having an arcuatesl-ot therein, a stop pin mounted on the free end of said holding pawland extending through said arcuate slot, a pair of links pivotallymounted coaxially with said wheel, an operating pawl pivotally mountedbetween the free ends of said links and adapted for engagement with theteeth of said sprocket wheel, an operatinglever rigid with saidoperating pawl, a floating cam member osc'illatably mounted coaxiallywith said wheel and having a cam arm adapted for moving into daily withsaid opera-ting pawl and on the free 8 s endsIof-said links, one .end'of said cam lever being adapted tor engagement with theopposing shoulrders on said floating cam, a stop on at leastone of said links forlimiting the movement of'said cam lever in one direction, and means. forbias.- i-ng said cam lever against saidstop.

v9. In a structure for effecting the moyement in a housing of aflexible, relatively inextensible means, the combination of a wheelrotatable in the housing, a pair'of pawls voperativelyassociated withthe wheel for controlling the rotation of said wheel, one of said pawlsbeing pivotally supported by the housing in offset relation to the wheeland having an engagingfree end directed toward the wheel, linkspivotally connect ing the other pawl to the wheel, a handle pivotallysupported by the other end of said links, the said other pawl comprisinga rigid extension of said handle, and floating cam means opera- .tivelyassociated with both pawls for step by step advance or retrogrademovement of the flexible means, said pawls being disposable in thedisassociated position relative to said flexible means when no load isimposed thereon for free reverse movement of the flexible means.

10. A structure for eflecting the movement of a flexible normallyinextensible means, said structure having a housing, in combination awheel means rotatably supported by said housing having a periphery overwhich-said flexible means passes, a load holding pawl pivoted upon saidhousing and normally biased into holding engagement with said flexiblemeans on the periphery of said wheel, an oscillatable flexible meansmoving pawl engageable with said flexi-ble means on the periphery ofsaid wheel and movable in one direction to rotate said wheel, a handlerigid therein for oscillating the same, link means pivotally supportingat one end said moving pawl and pivotally supported at its opposite endon said housing coaxially with the wheel axis, a cam member oscillatablysupported on said housing and movable from an inoperative position to anoperative position to move and hold said holding pawl out of holdingengagement with said flexible means, and means on said link meanseng-ageable with said cam member for oscillating the same into and outof moving and holding position.

11. In a structure for efiecting the movement of a flexible normallyinextensible means having a housing, the combination of wheel meansrotatably supported by said housing, a load holding pawl pivoted uponthe housing and normally constrained toward the wheel in a load holdingposition, a flexible means moving pawl, a handle rigid therewith foroscillating the same, link means pivotally supported at one end of saidhandle and the last mentioned pawl and at the other end being pivotallysupported by the said housing coaxially with the wheel, an oscillatingcam and latch member carried by the said housing and movable intocamming and latching position to move and hold said holdin pawl out ofload holding position, and means operably associated with said linkmeans and movable there- :by for oscillating said cam andlatch memberinto and out of latching position relatively to said holding pawl.

12. In a structure foroperating a flexible normally inextensible loadsupport and having a housing including an axle and a load wheelrotatablysupported upon said axle forearrying said s pp rt, incombination therewith, a load ho ing pawl pivoted upon saidhousing-normally biased into load holding position for holding saidwheel and load support, a supporting link pivotally mounted on saidhousing concentrically of said axle, an operating lever fulcrumed on oneend of said supporting link having a rigid load pawl at one end and ahandle extension on the other end thereof, said load pawl being movableinto and out of load operating position upon rocking said lever aboutits fulcrum, a latch pivotally mounted on said housing, a latch engagingmember on said holding pawl, and a lost motion actuating element on saidsupporting link operatively associated with said latch to move it intopawl latching engagement with said member upon said lever and supportinglink being moved to one predetermined position, and out of said latchingengagement to free said holding pawl upon said lever and supporting linkbeing moved to another predetermined position, said lever and load pawlbeing effective to manipulate the load through the lost motion movementintermediate said predetermined positions.

13. In a structure for operating a flexible normally inextensible loadsupport and having a housing including an axle and a load wheelrotatably supported upon said axle for carrying said support, incombination therewith, a load holding pawl pivoted upon said housingnormally biased into load holding engagement with said load support, asupporting link pivotally mounted on said housing concentrically withsaid axle, an operating lever fulcrumed on one end of said supportinglink having a rigid load pawl at one end and a handle extension on theother end theerof, said load pawl being movable into and 3 out of loadoperating engagement with said load suport upon rocking said lever aboutits fulcrum, a latch pivotally mounted on said housing, a latch engagingmember on said holding pawl, and a lost motion actuating element on saidsupporting link operatively associated with said latch to move it intopawl latching engagement with said member upon said lever and supportinglink being moved to one predetermined position, and out of said latchingengagement to free said holding 4 pawl upon said lever and supportinglink being moved to another predetermined position, said lever beingrockable upon said link into and out of load support engagement duringthe lost motion movement intermediate said predetermined 0 operatinglever fulcrumed on one end of said sup porting link having a rigid loadpawl at one end and a handle extension on the other end thereof, saidload pawl being movable into and out of load operating position uponrocking said lever about its fulcrum, a latch pivotally mounted on saidhousing concentrically with said axle with an arcuate portion thereofcut away to provide spaced stop shoulders thereon, a latch engagingmember on said holding pawl, and a lost motion actuating projection onsaid supporting link freely movable thereby through the cutaway portionof said latch during the load manipulating action of said holding pawl,and adapted to engage one of said shoulders when moved in one directionto effect engagement by said latch on said engaging member to render theholding pawl ineffective upon said supporting link being moved to onepredetermined position, and engage the other of said shoulders todisengage said latch from said engaging member and render said holdingpawl effective on said supporting link being angularly displaced toanother predetermined position.

15. In a structure for operating a flexible normally inextensible loadsupport and having a housing including an axle and a load wheel r0-tatably supported upon said axle for carrying said support, incombination therewith, a load holding pawl pivoted upon said housingnormally biased into load holding position for holding said wheel andload support, a supporting link pivotally mounted on said housingconcentrically of said axle, an operating lever fulcrumed on one end ofsaid supporting link having a rigid load pawl at one end and a handleextension on the other end thereof, said load pawl being movable intoand out of load operating position upon rocking said lever about itsfulcrum, a latch pivotally mounted on said housing concentrically withsaid axle having an arm portion movable into and out of latchingengagement with said holding pawl to render said holding pawlineffective when in latched position, said latch having :an arcuatecutaway portion concentric with said axle terminating in spaced stopshoulders, and a latch actuating member on said link movable throughsaid cutaway portion to provide a lost motion action relative theretoduring the manipulation of the load by said load pawl, and engageablewith said stop shoulders respectively at predetermined extreme positionsof said supporting link and lever for swinging said latch to and fromits pawl latching position.

FREDRICK W. COFFING.

References Cited in the file of this patent UNITED STATES PATENTS Number

